Based on the information given to this driver (via the xmit_more skb flag),
we can defer signaling the host if more packets are on the way. This will help
make the host more efficient since it can potentially process a larger batch of
packets. Implement this optimization.
Signed-off-by: K. Y. Srinivasan <k...@microsoft.com>
---
v2: Fixed up indentation based on feedback from David Miller.
v3: If the queue is stopped, deal with that condition: Eric Dumazet
<eric.duma...@gmail.com>
drivers/net/hyperv/netvsc.c | 20 ++++++++++++--------
drivers/net/hyperv/netvsc_drv.c | 2 ++
2 files changed, 14 insertions(+), 8 deletions(-)
diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
index ea091bc..36fef17 100644
--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c
@@ -743,6 +743,7 @@ static inline int netvsc_send_pkt(
u64 req_id;
int ret;
struct hv_page_buffer *pgbuf;
+ u32 vmbus_flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED;
nvmsg.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT;
if (packet->is_data_pkt) {
@@ -772,19 +773,22 @@ static inline int netvsc_send_pkt(
if (packet->page_buf_cnt) {
pgbuf = packet->cp_partial ? packet->page_buf +
packet->rmsg_pgcnt : packet->page_buf;
- ret = vmbus_sendpacket_pagebuffer(out_channel,
- pgbuf,
- packet->page_buf_cnt,
- &nvmsg,
- sizeof(struct nvsp_message),
- req_id);
+ ret = vmbus_sendpacket_pagebuffer_ctl(out_channel,
+ pgbuf,
+ packet->page_buf_cnt,
+ &nvmsg,
+ sizeof(struct
+ nvsp_message),
+ req_id,
+ vmbus_flags,
+ !packet->xmit_more);
} else {
- ret = vmbus_sendpacket(
+ ret = vmbus_sendpacket_ctl(
out_channel, &nvmsg,
sizeof(struct nvsp_message),
req_id,
VM_PKT_DATA_INBAND,
- VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
+ vmbus_flags, !packet->xmit_more);
}
if (ret == 0) {
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index 5993c7e..4efaa6e 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -435,6 +435,8 @@ check_size:
packet->page_buf = page_buf;
packet->q_idx = skb_get_queue_mapping(skb);
+ if (netif_tx_queue_stopped(netdev_get_tx_queue(net, packet->q_idx)))
+ packet->xmit_more = false;
packet->is_data_pkt = true;
packet->total_data_buflen = skb->len;
--
1.7.4.1
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